EEHack 2019 update

[spfautsch]

Hey steveo I thought of one other thing when I was flashing earlier - I know it probably is dependent on the parameter being configured in the definition file, but if it's not a huge amount of trouble it would be really informative (and for newbs maybe you can make it bark at them about bricking their ecu) to show the input voltage on the flash window.

kur4o I've been messing with the wideband with the Innovate serial logger and noticed the non-linearity of the D27 input - did putting the input on D25 improve this?

[kur4o]

I hard wired pin D25 to read injector voltage for my ls1 injector patch and didn`t have the chance to try it on the wideband input. I suppose it will be much more stable and accurate since there will be no voltage potential difference. The resolution will sucks but if you can reset the wideband to read 11-16afr = 0-5 volts it will have enough resolution. Innovate 1wire ground widebands design is bad due to using PWM modulated heater for the sensor. I did some experiments and could see the afr changing with the frequency of the PWM circuit. I also have some terrible emi noise from the gauge and used all kind of tricks to settle it down.

0.454v = 1 lambda <> necessarily equal 14.7:1

I am sure the narrowbands 02s are set to read 14.7 at 0.454v.
1 Lambda is the perfect mixture of air to fuel[cleanest combustion process] and is different for different fuels.
1 lambda equals to

Petrol 14.7:1
Diesel 14.6:1
Methanol 6.4:1
Ethanol 9:1
LPG 15.5:1

Here is good write up about it.
AFRlink

Given this to trick the narrowbands to read lower lamda, fattening the switch voltage of the o2s upto 0.545-0.57 might give you the best results. If you fatten more it can result with poor CL performance. Some real time play with 02 swing voltage will get you to the max of deviations.


The key shortcuts for the eehack controller window are already there by your request and are working great. I had plans to expand them to more controls but never get there.

[spfautsch]

Innovate 1wire ground widebands design is bad due to using PWM modulated heater for the sensor. I did some experiments and could see the afr changing with the frequency of the PWM circuit. I also have some terrible emi noise from the gauge and used all kind of tricks to settle it down.

Was the signal stable over the serial output or was the modulation only present on the analog output?

I am sure the narrowbands 02s are set to read 14.7 at 0.454v

Sorry to have to continue to split hairs with you but no, they're set to read lambda at 0.454v. I will agree that with "petrol" that's 14.65 parts air to 1 part fuel.

The problem is here in the states the retailers are no longer required to specify how much ethanol is in the product they're selling as gasoline, and our government heavily subsidizes corn ethanol production as a "clean" alternative fuel. They aren't even required to acknowledge it's presence. Yet I can pour a cup of distilled water in a gallon of this so-called gasoline, and it magically dissolves. What is it dissolving into? Water doesn't bond molecularly with petroleum based fuels. It's why I laugh hilariously when I see people buying methanol based fuel "drying" additives.

Some real time play with 02 swing voltage will get you to the max of deviations.

I definitely want to work with this, but it will be a final finishing touch. Right now I'm painting in very broad strokes. I have a set of modified injectors that I need to find the flow constant of. They're rated at 42lb/hr, but it will barely idle with the injector constant below 42.3. It likes 42.7.

The key shortcuts for the eehack controller window are already there by your request and are working great. I had plans to expand them to more controls but never get there.

I know - wasn't belittling your work, it's brilliant. Simply pointing out that clicking some of the controls while sitting in an idling car with a lumpy cam is difficult at best.

Quick question while I'm thinking about it - is it safe to use steveo's version with the v4 patches?

[kur4o]

they're set to read lambda at 0.454v

I completely agree with this statement. Maybe we are using different terminology for the same thing.

Was the signal stable over the serial output or was the modulation only present on the analog output?

i didn`t compare it with the gauge serial datastream. I guess there will be no variation on the serial output. It Affects only the 0-5 output.

Which reminds for a past eehack addition request.

Steveo, can you add a wideband stream through a second serial port. Most of the wideband gauges have a serial output. That way we eliminate all the havock related with setting accurate reading through a 0-5v input.

Quick question while I'm thinking about it - is it safe to use steveo's version with the v4 patches?

The v4 patch is backwards compatible with all previous version of eehack. The stock mode4 message structure is intact. I added new stuff to some unused bits and extended the message on request. So is it pretty safe to use and all controls will work as expected.

[spfautsch]

Maybe we are using different terminology for the same thing.

No, you're just assuming I'm burning iso-octane when in fact it's a blend of ethanol, gasoline, and other stuff.

Steveo, can you add a wideband stream through a second serial port. Most of the wideband gauges have a serial output.

This is where I was heading. The problem is that we would have to reverse engineer the serial datastream for each vendor.

The v4 patch is backwards compatible with all previous version of eehack. The stock mode4 message structure is intact. I added new stuff to some unused bits and extended the message on request. So is it pretty safe to use and all controls will work as expected.

Thank you - I thought this was the case but didn't want to find out I was wrong at 75mph.

[steveo]

i can't imagine i'll have the time to implement and test supporting another serial port wideband input, the way eehack is written that'd be an entirely different datastream, it wasn't written with this kind of stuff in mind so it'd either be really hacky or a lot of work.

i know there's lots of stuff it'd be nice to have guys but i'm still focusing on bug fixes, i have other stuff to work on too

[spfautsch]

i can't imagine i'll have the time to implement and test supporting another serial port wideband input

Sorry, I wasn't implying you should do the work.

the way eehack is written that'd be an entirely different datastream, it wasn't written with this kind of stuff in mind so it'd either be really hacky or a lot of work.

I'm pretty good at "hacky". ;-)

I may attempt this for the Innovate controllers once you're finished with the bugfix release (as a fork). Offhand, how much work do you think it would entail to define an input that derives it's data from something other than the ALDL data? I'm guessing a bunch... This will probably be a good project for next winter, if at all.

Edit: hmmm, splicing another datastream into the .eedata would be really useful with my ignition controller.

In the mean time I'll have to play around with narrowing the output range of the LC2 and see how much it improves the nonlinearity.

i have other stuff to work on too

What nerve? You mean you have a life outside of writing software for us freeloading bums? ;-)

[lionelhutz]

I am sure the narrowbands 02s are set to read 14.7 at 0.454v.

Not one O2 or UEGO sensor made has a clue about AFR numbers. Every O2 sensor display of AFR is due to someone having programming a lambda to AFR lookup for the display.

Do you happen to mean that the PCM is programmed to interpret the 0.454V output from the O2 sensor as an AFR of 14.7:1????

In reality, the PCM will closed loop tune to the fuel assuming the base VE and MAF tables are close and the fuel stoichiometric ratio doesn't deviate too far (and BLM limits allow it). I would expect it could close loop tune to the various typical ethanol blends other than E85, it would likely tune OK in the 0-15% blend range.

[Casey96SS]

Would it be possible to add an easy way to switch off PE mode? It would be kind of convenient to do that when tuning VE tables and not have to flash a separate tune with PE disabled.